Machine Design
The objective of idler pulley in belt drive is to

Increase the power transmission capacity
All the above objectives
Increase the wrap angle and belt tension
Decrease the tendency of belt to slip

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Machine Design
A bolt of uniform strength can be developed by

Keeping the core diameter smaller than the diameter of the unthreaded portion
None of these
Keeping the core diameter of threads equal to the diameter of unthreaded portion of the bolt
Keeping the nominal diameter of threads equal to the diameter of unthreaded portion of the bolt

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Machine Design
The elasticity is the property of a material which enables it to

Retain deformation produced under load permanently
Draw into wires by the application of a tensile force
Resists fracture due to high impact loads
Regains its original shape after deformation when the external forces are removed

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